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Frequency synthesizer with dynamically selected level shifting of oscillating output signal

A level shifter and output signal technology, which is applied in power oscillators, electrical components, automatic control of power, etc., can solve problems such as slowness

Pending Publication Date: 2020-06-16
STMICROELECTRONICS SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another challenge is that digital circuits such as level shifter circuit 54 must meet certain maximum speed requirements even at the lowest possible supply voltage at slow process corners and worst case temperature values

Method used

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  • Frequency synthesizer with dynamically selected level shifting of oscillating output signal
  • Frequency synthesizer with dynamically selected level shifting of oscillating output signal
  • Frequency synthesizer with dynamically selected level shifting of oscillating output signal

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Experimental program
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Embodiment Construction

[0019]right now Figure 5 For reference, there is shown a block diagram of a frequency synthesizer circuit 50' of the locked-loop operation type with dynamically selected level-shifting operation. Like reference numerals refer to as Figure 2 to Figure 3 Like or similar components shown in .

[0020] control oscillator 52 (for example including figure 1 A CCO circuit 10 of the type shown in ) includes a ring oscillator 12 that generates an oscillating output signal 13Fout. The level shifter circuit 54 receives the oscillating output signal 13Fout, performs a level shift operation to level shift the oscillating output signal Fout from Vs to the Vddb level of the second power supply domain, and thus generates a level-shifted oscillating output signal 13' . A first input of the digital multiplexer 90 is coupled to receive the level shifted oscillating output signal 13' and a second input of the digital multiplexer 90 is coupled to receive the (non-level shifted) oscillating ...

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Abstract

An oscillator circuit powered by a source voltage generates an oscillating output signal. The oscillating output signal is level shifted and applied to a first input of a multiplexer. A second input of the multiplexer receives the oscillating output signal. The multiplexer selects one of the oscillating output signal and the level shifted oscillating output signal for output as a selected oscillating output signal in response to a select signal. A locked loop circuit generates controls a frequency of the oscillating output signal as a function of the selected oscillating output signal and a reference oscillating signal. The select signal further selects one of a reference voltage and the source voltage of the oscillator circuit as an error amplifier reference voltage for a voltage regulator circuit that generates the first power supply voltage.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority to U.S. Provisional Patent Application Serial No. 62 / 777,446, filed December 10, 2018, the disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates generally to a frequency synthesizer and, in particular, to the dynamic selection of a level shifting operation performed on an oscillating output signal from a current controlled oscillator of the frequency synthesizer. Background technique [0004] right figure 1 For reference, a circuit diagram of a conventional current controlled oscillator (CCO) circuit 10 is shown. The CCO circuit 10 includes a ring oscillator 12 formed of an odd number of inverting delay elements 14(1) to 14(n) connected in series. The output of one inverting delay element is connected to the input of the next inverting delay element, and the output of the last inverting delay element 14(n) is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B1/00H03B5/36
CPCH03B1/00H03B5/366H03L7/0995H03L7/18H03L7/08H03L7/101H03L7/087
Inventor N·古普塔
Owner STMICROELECTRONICS SRL